An sterile inflatable device intended to be temporarily implanted to enlarge tissue, typically the dimensions of a skin flap where there is insufficient tissue coverage to accommodate the volume of a long-term implantable device (e.g., a breast implant), or for the revision of a scar or cutaneous defect. The device typically consists of an expansion envelope (e.g., silicone elastomer) with fill tube, and an inflation valve, and is managed by a healthcare professional. This is a single-use device.